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We study the spin-1/2 antiferromagnetic Heisenberg chain in both uniform and(perpendicular) staggered magnetic fields using the density-matrixrenormalization-group method. This model has been shown earlier to describe thephysics of the copper benzoate materials in magnetic field. In the presentwork, we extend the study to more general case for a systematic investigationof the field-induced gap and related properties of the spin-1/2antiferromagnetic Heisenberg chain. In particular, we explore the high magneticfield regime where interesting behaviors in the field-induced gap,magnetization, and spin correlation functions are found. Careful examination ofthe low energy properties and magnetization reveals interesting competingeffects of the staggered and uniform fields. The incommensurate behavior in thespin correlation functions is demonstrated and discussed in detail. The presentwork reproduces earlier results in good agreement with experimental data oncopper benzoate and predicts new interesting field-induced features at veryhigh magnetic field.Comment: 8 pages, 6 figure

physical review. b, condensed matter

Field-induced gap in the spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>antiferromagnetic Heisenberg chain: A density-matrix renormalization-group study

Field-induced gap in the spin-12antiferromagnetic Heisenberg chain: A density-matrix renormalization-group study